--> . 9 .

 


 

>> 9 .

4.

 


15. ()

, : (Na2S, MgS), (Na2Se), (Na2Te):

    Mg + S = MgS

H2R (H2S, H2Se, H2Te):

    2 + S = H2S

.

. , , (Z) .

VIA- ( ) +2, +4 +6, :

(. 14).

- VIA-

VIA-

1. VlA-, ?

2. , +4 +6.

3. .

4. , . .

5. . ?

6. , .

7. , , , .

8. , .

9. .

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